During the last decades many theoretical and experimental works have been directed towards the analysis of EHL in different types of gears, but only a few in spiral bevel and hypoid gears. The method of thermal EHD lubrication analysis is examined. The oil viscosity variation with respect to pressure and temperature and the density variation with respect to pressure are included. The real geometry and kinematics of the spiral bevel gear pair is applied, thus the exact geometrical separation of the mating tooth surfaces is included in the oil film shape, and the real velocities of these surfaces are used in the Reynolds and energy equations. The EHD lubrication characteristics considerably depend on the equation by which the pressure-viscosity relation is described. The use of thicker oils is with positive effects on EHD load carrying capacity of the oil film, but in the field of higher viscosities this effect mostly diminishes. By the increase in speed and by the reduction of minimum oil film thickness, the EHD load carrying capacity is considerably improved. This is an abstract of a paper presented at the 2010 Society of Tribologists and Lubrication Engineers Annual Meeting (Las Vegas, NV 5/16-20/2010).